#include <bits/stdc++.h>

using namespace std;
#define ll long long
const ll DUMMY = 1e18;

ll terms(ll start, ll delta, ll its) {

    ll ans = start * its;
    ans += delta * (its * (its - 1)) / 2;

    return ans;

}

ll get(string s) {
    
    for (char c : s) {
        if (c == '-') continue;
        if ('0' <= c && c <= '9') continue;
        return DUMMY;
    }

    return atoll(s.c_str());

}

array<ll,3> extract(string s) {

    int comma = find(s.begin(), s.end(), ',') - s.begin();

    string bf, af;
    int ptr = comma;
    while (s[ptr - 1] != '(') {
        bf.push_back(s[--ptr]);
    }
    ptr = comma;
    while (s[ptr + 1] != ')' && s[ptr + 1] != ',') {
        af.push_back(s[++ptr]);
    }
    reverse(bf.begin(), bf.end());

    string diff;
    if (s[++ptr] == ',') {
        while (s[ptr + 1] != ')') {
            diff.push_back(s[++ptr]);
        }
    }
    else diff = "1";

    return {get(bf), get(af), get(diff)};

}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    string cur;
    getline(cin, cur);
    getline(cin, cur);
    auto [a, b, c] = extract(cur);

    getline(cin, cur);
    auto [D, E, F] = extract(cur);

    vector<ll> seq;    
    if (c > 0) {
        for (ll i = a; i < b; i += c) {
            seq.push_back(i);
        }
    }
    else {
        for (ll i = a; i > b; i += c) {
            seq.push_back(i);
        }
    }

    ll ans = 0;
    for (ll x : seq) {
        
        ll d = (D == DUMMY ? x : D);
        ll e = (E == DUMMY ? x : E);
        ll f = (F == DUMMY ? x : F);

        if (f > 0) {
            ll st = d;
            ll its = (max(0ll, e - d) + f - 1) / f;
            ans += terms(st, f, its);
        }
        else {
            ll st = d;
            ll its = (max(0ll, d - e) + (-f) - 1) / (-f);
            ans += terms(st, f, its);
        }

    }

    cout << ans << "\n";

}